diff --git a/lib/galaxy/webapps/galaxy/api/library_datasets.py b/lib/galaxy/webapps/galaxy/api/library_datasets.py
index e16bf43f9d5..e8f0823163b 100644
--- a/lib/galaxy/webapps/galaxy/api/library_datasets.py
+++ b/lib/galaxy/webapps/galaxy/api/library_datasets.py
@@ -624,7 +624,7 @@ class LibraryDatasetsController(BaseAPIController, UsesVisualizationMixin, Libra
                 outfname, zpathext = os.path.splitext(zpath)
 
                 if zpathext == '':
-                    path = '.'.join([path, ldda.extension]) # Add extension if we don't have one
+                    path = '.'.join([path, ldda.extension])  # Add extension if we don't have one
 
                 if is_composite:
                     # need to add all the components from the extra_files_path to the zip